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Historic Masonry & Exterior Restoration
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Historic Masonry & Exterior Restoration
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Stone and brick exteriors are among the most recognizable features of Main Line historic homes — and among the most commonly mishandled in renovations that don’t account for how older masonry actually behaves. Mainline reBuild restores historic masonry and exteriors throughout the Main Line and greater Philadelphia using materials and techniques suited to a building’s age.
What Historic Masonry Restoration Involves
Older masonry — particularly stone and lime-mortar brick construction common in Main Line homes built before the 1930s — behaves differently than modern materials. Restoration begins with assessing mortar composition, moisture patterns, and existing damage before any repair work begins, since using the wrong repair materials can accelerate deterioration rather than prevent it.
Why Modern Materials Can Damage Historic Masonry
A common mistake in historic masonry repair is using modern Portland cement mortar on buildings originally built with lime mortar. Lime mortar is more porous and flexible than cement, allowing moisture to escape through the mortar joints rather than the masonry itself. Repointing with cement mortar traps moisture inside the stone or brick, often accelerating cracking and deterioration that the repair was meant to prevent.
Moisture Management for Masonry Exteriors
Water intrusion is one of the primary causes of masonry deterioration over time — through cracked mortar joints, failed flashing, or inadequate drainage away from foundation walls. Addressing these moisture pathways is typically as important to a masonry restoration project as the visible repair work itself.
Restoring Character-Defining Exterior Details
Beyond structural masonry, historic exteriors often include architectural details — stone lintels, decorative brickwork, original window surrounds — that define a property’s character. Restoration work aims to preserve or accurately match these details rather than simplifying them during repair.
Common Signs of Masonry Deterioration
Several warning signs typically indicate masonry in need of attention: cracked or crumbling mortar joints, efflorescence (white mineral deposits on the surface), spalling brick where the face of the brick is flaking away, bowing or leaning walls, and visible water intrusion or staining. Identifying these signs early allows repairs to address the underlying cause rather than just the visible damage.
Long-Term Preservation
Preserving historic masonry is an ongoing process rather than a one-time repair. Regular inspections, properly functioning gutters and downspouts, and managing moisture around the foundation all help prevent the conditions that lead to masonry deterioration over time.
Our Restoration Process
01 — Initial Assessment
We evaluate the condition of existing masonry, mortar composition, and moisture patterns before proposing a restoration approach.
02 — Materials Planning
Repair materials are selected to match the original construction — particularly mortar composition for older lime-mortar buildings.
03 — Restoration & Coordination
Our team coordinates repointing, masonry repair, moisture management improvements, and detail restoration work.
04 — Final Walkthrough
Completed restoration work is reviewed to confirm quality and long-term durability.
Serving the Main Line & Greater Philadelphia
We provide historic masonry and exterior restoration services throughout Narberth, Ardmore, Bryn Mawr, Villanova, Gladwyne, Wayne, Haverford, Wynnewood, and surrounding Philadelphia communities across Southeastern Pennsylvania and Delaware County.